为了有效降低低轨道原子氧辐照对黏结固体润滑涂层摩擦学性能的影响,满足航天器机械运动机构对空间润滑材料高可靠、长寿命的要求,在MoS_2/酚醛环氧树脂涂层中添加六甲基二硅胺烷修饰的SiO_2,制备了复合涂层,并用原子氧地面模拟装置进行辐照.分别采用X射线光电子能谱(XPS)、CSM摩擦磨损试验及扫描电子显微镜(SEM)分析了涂层原子氧辐照前后的化学组成、摩擦磨损性能及磨痕形貌.结果表明:添加SiO_2在一定程度上提高了MoS_2/酚醛环氧树脂涂层的抗原子氧剥蚀和摩擦磨损性能;添加2%SiO_2的涂层在原子氧辐照前后摩擦系数最低,耐磨性能最佳;当SiO_2添加量为1%时,涂层辐照前后的耐磨寿命最长.
In order to meet the. requirement for high reliability and long service life of space movement mechanisms, hexamethyldisilazane modified SiO_2 was incorporated into MoS_2-doped pbenolic-epoxy resin-based bonded solid lubricating coatings to prepare multi-component composite coatings. The resulting composite coatings were irradiated by atomic oxygen (AO) generated in a ground-based simulation system. The friction and wear behavior of the composite coatings before and after atomic oxygen irradiation was evaluated using a CSM friction and wear tester. The composition and wear scar morphology of the composite coatings before and after atomic oxygen irradiation were analyzed by means of X-ray photoelectron spectroscopy and scanning electron microacopy. It was found that atomic oxygen irradiation led to partial oxidation of the surface of the composite coating, causing increase of friction coefficient and decrease of wear resistance of the compoaite coatings. Fortunately, the addition of SiO_2 contributed to improved friction-reducing ability and resistance to wear and atomic oxygen irradiation of the composite bonded solid lubricating coatings. Namely, the composite coatings containing 2% ( mass fraction) SiO_2 had the lowest friction coefficient before and after atomic oxygen irradiation, and the composite coating containing 1% SiO_2 had the longest antiwear life before and after atomic oxygen irradiation.
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